|Not a pic of Richard|
Now that I know what they are, I've been looking for them and its true, nearly every baby I've seen has these markings. The markings are most common on the behind, but they also occur on the back. Our co-worker's baby, even has one on her shoulder. Wikipedia explains, "It results from the entrapment of melanocytes in the lower half to two-thirds of the dermis during their migration from the neural crest to the epidermis during embryonic development" Basically, its just some type of discoloration of the skin that occurs during development in the womb and is corrected as the child develops further. Living in a foreign country is quiet intriguing. You never know what our going to learn next.